both are different designs.
ics has a modular gearbox, in which you can change the spring only by breakibg the barrel and doing a small procedure.
ca ar15s are of regular v2 gearbox designs.
externally wise, I prefer ca over ics. the same with the internals.
btw, if you are choosing between sportlines, the ics normally breaks the plastic lower receiver on the back pinion. be warned, as ive seen several of those having thqt issue.